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PLEASE HELP AND EXPLAIN HOW TO DO IT IM CONFUSED

PLEASE HELP AND EXPLAIN HOW TO DO IT IM CONFUSED-example-1

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3\sqrt5-2\sqrt7+√(45)-√(28)=\\3\sqrt5-2\sqrt7+√(9\cdot5)-√(4\cdot7)=\\3\sqrt5-2\sqrt7+3√(5)-2√(7)=\\6\sqrt5-4\sqrt7

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